Figure 4.3. Polar radiation pattern (Directivity) at fr=0.1936 GHz

From

Design of a Novel Sierpinski Fractal Antenna Arrays Based on Circular Shapes with Low Side Lobes for 3G Applications

Manas Ranjan Jena, B.B. Mangaraj, Rajiv Pathak

American Journal of Electrical and Electronic Engineering. 2014, 2(4), 137-140 doi:10.12691/ajeee-2-4-3